I had a abortion on may 17th I went back for my follow up apt and I was told that I still had some tissue left inside me so I had to have a 2nd abortion?? Is this possible?? Please help Im so confused I never heard of this.

The second procedure is not an abortion (as that was already accomplished by the first procedure). What this is, is a second D&C (dilation and curettage) to remove the remaining tissue. This is likely the same procedure they used the first time, so that's why it's confusing.